The multidisciplinary, scientific study of old age is called:
a) 7.
b) gerontology.
c) psychology.
d) demography.

On this map of the united states the letter h indicates high pressure and the letter l indicates low pressure . select the black arrow that accurately shows the direction of the wind.

What does the map above tell us about the endemity of typhoid fever

Choose the correct chronological or of the time periods